.box {
    width: 50px;
    height: 50px;
    background: blue;
    margin: 10px;
}

.dragging {
    border: 5px dashed #000;
    box-sizing: border-box;
}

.drag-layer {
    position: fixed;
}

.container {
    width: 300px;
    height: 300px;
    border: 1px solid #000;
    border-radius: 12px;
    display: flex;
    flex-wrap: wrap;
    justify-content: start;
    // align-items: start;
    align-content: start;
}